scholarly journals Failure analysis of a water wall tube

2020 ◽  
Vol 1635 ◽  
pp. 012072
Author(s):  
Facai Ren ◽  
Jinsha Xu ◽  
Jun Si
Keyword(s):  
Failure Analysis ◽  
Water Wall ◽  
Water Wall Tube

Failure Analysis and Welding Repair for Water Wall Connection Tube Burst of SA210C Steel

2014 ◽  
Vol 998-999 ◽  
pp. 422-425 ◽  
Author(s):  
Xiang Feng Zheng ◽  
Nan Wu ◽  
Yun Jian Jiang ◽  
Wen Bin Li ◽  
Xiao Jun Hao ◽  
...  
Keyword(s):  
Residual Stress ◽  
Chemical Analysis ◽  
Failure Analysis ◽  
Heat Input ◽  
Mechanical Analysis ◽  
Raw Material ◽  
Material Defects ◽  
Microscope Analysis ◽  
Water Wall ◽  
Water Wall Tube

Through methods, such as microscope analysis, mechanical analysis, chemical analysis, metallography examination etc, the causes resulting in water wall tube bursting of 300MW station boiler have been analyzed. The raw material defects is the primarily inducement of bursting failure. In welding tube, the measures of reducing residual stress, such as lower welding heat input, reducing thickness of welding layer and so on, were taken. The welding repair succeeded greatly.

Failure Analysis of Spiral Water Wall Tube Cracking in Ultra-Supercritical Power Plant Boiler

2016 ◽  
Author(s):  
Jun Si ◽  
Zhenrong Yan ◽  
Jianjun Chen
Keyword(s):  
Residual Stress ◽  
High Temperature ◽  
Power Plant ◽  
Failure Analysis ◽  
Power Plants ◽  
Composition Analysis ◽  
Element Analysis ◽  
Water Wall ◽  
Water Wall Tube ◽  
Weld Heat

The efficiency of conventional boiler/steam turbine fossil power plants has strong relationship to the steam temperature and pressure. At present, steam temperatures of the most efficient fossil power plants are now in the 600°C range. Higher-strength materials are needed for upper water wall tube of boilers with steam pressure above 24 MPa. A high-strength 2.5%Cr steel recently approved by ASME code as T23 is the preferred candidate material for this application. Due to its superior properties, T23 steel is typically not post-weld heat treated. However, after several years running there are a lot of incident reports for T23 tubes especially the breakage of weldment in the ultra-supercritical power plant. This is cause for concern for T23 tubes weldment used under high temperature environments. Previous studies showed that the residual stress may play an important role to the performance of spiral water wall tube. In this paper, the distribution of residual stress in T23 tube weldment has been investigated in detail. Inner wall cracks were found at the butt-jointed seam region of spiral water wall tubes by radiographic testing after one year’s operation. Failure analysis of the spiral water wall tube cracking was conducted by chemical composition analysis, mechanical testing and finite element analysis in this paper. It was found that localized residual stress after the weld process caused concentrated stress, which is the primary reason for failure. Our studies illustrate the necessity of post weld heat treatment for the T23 tubes used under high temperature.

Failure analysis of water wall tube in circulating fluidized bed boiler

2021 ◽  
Author(s):  
Yayak Triasdian ◽  
Nur Achmad Busairi ◽  
Halomoan Parningotan T. S. ◽  
Muhammad Akhsin Muflikhun
Keyword(s):  
Failure Analysis ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulating Fluidized Bed Boiler ◽  
Water Wall ◽  
Water Wall Tube

scholarly journals Failure analysis of the boiler water-wall tube

2017 ◽  
Vol 9 ◽  
pp. 35-39 ◽  
Author(s):  
S.W. Liu ◽  
W.Z. Wang ◽  
C.J. Liu
Keyword(s):  
Failure Analysis ◽  
Boiler Water ◽  
Water Wall ◽  
Water Wall Tube

Failure analysis of the water-wall tube in KIVCET waste heat boiler

2021 ◽  
Vol 121 ◽  
pp. 105155
Author(s):  
Jiadong Li ◽  
Ping Zhou ◽  
Gang Yu ◽  
Hongjie Yan ◽  
Zhuo Chen ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Waste Heat ◽  
Waste Heat Boiler ◽  
Water Wall ◽  
Water Wall Tube
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